Plenty of time
Maybe they looked at the stats on time taken to complete by past candidates over the years since cyberexams were introduced. Its one of those subjects where you know the answer or you don't. Dwelling too much on the options doesn't help.
If the content and database is the same, 90 mins won't impact on your result.
It's a tricky subject, mostly because of the breadth of subject matter and learning cockpit systems without the benefit of having them to practice on.
Time is not the breaker.